<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <ol id="elem">
        <li>Hello</li>
        <li>World</li>
    </ol>

    <script>
        function clear(elem) {
            elem.innerHTML = '';
            // [...elem.children].forEach((el) => {
            //     el.remove();
            //     // console.log(el);
            // })
        }
        clear(document.getElementById('elem')); // 清除列表
    </script>
</body>

</html>